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To remove this ice, the evaporator is automatically
defrosted. In the process, steam may be visibly
released from the outdoor unit.
Compressor
The compressor is the central component of the heat
pump. The compressor raises the refrigerant to the
temperature level required for the heating mode.
Depending on the energy required in the building, the
speed of the compressor will be adjusted to the output
required.
Condenser
The condenser is a heat exchanger that transfers ther-
mal energy from the heat pump to the heating system.
Flow temperature
The flow temperature is the temperature at which the
heating water or coolant enters a system component
such as a heating/cooling circuit.
Heat pump cascade
A heat pump cascade consists of two linked heat
pumps that are switched on individually or together,
depending on the demand for heat or cooling.
In a heat pump cascade, each heat pump has its own
control unit. One of the heat pumps takes the role of
lead heat pump and controls the entire heat pump cas-
cade.
You make the settings for room heating/cooling,
DHW heating and functions only on the programming
unit of the lead heat pump.
On the programming unit of the slave heat pump, not
all menus are available.
Checks and other settings such as language, or the
display brightness, can be made on all programming
units.
Time program
In the time programs, you specify what your heating
system should do at what time.
Operating status
The operating status indicates how a component of
your heating system is being operated.
For example, the operating statuses for central heating
have different temperature levels.
The times for the operating status changeover are
defined when the time programs are set.
DHW circulation pump
The DHW circulation pump transports the DHW
around a loop line between the DHW cylinder and the
draw-off points (e.g. hot tap). This ensures that hot
water is rapidly available at the draw-off points.
Appendix
Terminology (cont.)
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70


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